1、前端json格式

{
    "name":"zhangsan",
    "age":23,
    "hobby":[
        {
            "hobbyname":"爬山",
            "level"："非常喜欢"
        },
        {
            "hobbyname":"游泳",
            "level"："一般喜欢"
        }
     ]
}

2、后端Bean，注意：重点是需要重写toString方法

class User{
   private String name;
   private int age;
   private List<Hobby> bobby;
   //set get
}

class Hobby{
    private String hobbyname;
    private String level;
    //set get

    //重写toString
    @Override
    public String toString(){
    
        return "{" + 
                "\"hobbyname\":\"" + hobbyname + "\"," +
                "\"level\":\"" + level + "\"
                "}";
    }
}

3、后端接收

@RequestMapping(value="add",method=RequestMethod.POST)
public Object add(@RequestBody User user){
    //
}

4、接收前端数据、和返回前端数据均是Json格式的字符串。